Amazon Linux AMI Security Advisory: ALAS-2015-630
Advisory Release Date: 2015-12-14 15:14 Pacific
An unsafe use of string concatenation in a shell string occurs in FontManager. If the developer allows the attacker to choose the font and outputs an image, the attacker can execute any shell command on the remote system. The name variable injected comes from the constructor of FontManager, which is invoked by ImageFormatter from options.
Run yum update python-pygments to update your system.